JPH0313109A - Volume control device - Google Patents

Abstract

PURPOSE:To automatically control the volume of a sounding body to an optimum level in correspondence to an environmental condition such as surrounding volume, by detecting the volume around the sounding body and the number of persons and using fuzzy inference. CONSTITUTION:The surrounding volume is detected by a volume sensor 1 and sent to a fuzzy inference part 3 and the number of surrounding passengers M, etc., on a platform is detected by a human body detection sensor 2 and sent to the fuzzy inference part 3. In the fuzzy inference part 3, based on the inputted volume and number of the persons, the optimum volume level in the condition is calculated by using the fuzzy inference and the value of the optimum level is sent to a volume control part 4. Based on the inputted volume level, the volume control part 4 controls the volume to be outputted by a speaker 5. Thus, the volume of the speaker 5 is increased or decreased in correspondence to the volume or noise, etc., or the number of the persons on the platform and broadcasted contents are transmitted to the passengers without fail. Further, the volume is automatically controlled not to be the high level more than need.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a volume control device for keeping the volume emitted by a sounding body such as a loudspeaker to an optimum level.

(Summary of the Invention) This invention detects the volume and the number of people around the sounding body, and uses fuzzy reasoning to automatically adjust the output volume of the sounding body to an optimal level.

(Prior art and its problems) Conventionally, loudspeakers installed on station platforms are
Since the volume is not adjusted every time there is a change in the surrounding sound transmission situation, the volume is often too loud and may cause a nuisance to the surrounding residents.

Additionally, in homes, the volume of the telephone bell is generally set to a high level, and the volume remains constant unless adjusted, so the ringing of the telephone may wake up a sleeping child in the same room.

Although these sounding bodies such as loudspeakers and telephone bells can change the volume by changing the volume, they cannot be adjusted in real time according to changes in the environment.

(Purpose of the Invention) This invention was made to solve the above problems, and its purpose is to automatically adjust the volume of the sounding body to the optimal level according to environmental conditions such as the surrounding volume. Target 11!
An object of the present invention is to provide a volume control device that can adjust the volume.

(Structure and Effects of the Invention) In order to achieve the above object, the present invention uses a sensor that detects the volume around the sounding body, a sensor that detects the number of people around the sounding body, and a membership function based on the outputs of both sensors. The present invention is equipped with a means for calculating the necessary and minimum output volume value according to the surrounding situation through fuzzy inference using , and a means for adjusting the output level of the sounding body based on the calculated output volume value. Features.

In this way, the present invention calculates the necessary and minimum output volume according to the surrounding situation using fuzzy inference from the detected volume around the sounding body and the number of people, and adjusts the volume of the sounding body to al1.
Therefore, if the surrounding volume is loud due to noise or if there are many people, the volume of the sounder can be increased, and if the surrounding area is quiet or there are only a few people, the volume of the sounder can be adjusted to be lower. By always setting the volume to the optimum level according to the situation, it is possible to prevent unnecessary loudness from causing a nuisance to those around you.

Furthermore, by using fuzzy inference means in the arithmetic unit that calculates the optimum volume, the configuration of the arithmetic unit can be simplified and processing can be performed at high speed.

(Explanation of Examples) Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a diagram showing the overall configuration when this invention device is applied to a loudspeaker installed on a station platform.

In the figure, a sound volume sensor 1 installed on a pillar 6 of the platform detects the surrounding sound volume and sends it to the fuzzy inference section 3.

The human body detection sensor 2 also installed on the pillar 6 detects the number of passengers M, etc. on the surrounding platforms and sends it to the fuzzy inference section 3.

The fuzzy inference unit 3 uses fuzzy inference to calculate the optimal volume level for the situation based on the input volume and number of people, and sends the value to the volume adjustment unit 4.

The volume control unit 4 is installed on the opposite side of the pillar 6, and adjusts the volume output by the loudspeaker 5 based on the input volume level.

This device detects the volume of noise, etc., and the number of people on the platform, and increases or decreases the volume of the loudspeaker 5 according to the detected values, thereby ensuring that the broadcast content is transmitted to passengers getting on and off the train, and at the same time ensuring that the volume of the loudspeaker 5 is not louder than necessary. is automatically adjusted so that it is not too large.

FIG. 2 is a block diagram illustrating the fuzzy inference section 3 shown in FIG. 1 in more detail.

In the figure, the volume signal S1 output from the volume sensor 1
is sent to the sample and hold circuit 21.

The human body detection signal S2 output from the human body detection sensor 2 is
The signal is sent to the sample and hold circuit 22.

The sample and hold circuits 21 and 22 hold the input volume signal S1 and human body detection signal s2 at predetermined intervals, and send them to the fuzzy inference device 23 as signals x1 and x2.

The fuzzy inference device 23 receives the input signal χ1. An output signal obtained by calculating the optimal output value based on the fuzzy rule of block 24 by fuzzy inference according to the fitness (membership value) of the number of memberships of x2, and defuzzifying the result. Send y1 to amplifier 25.

The fuzzy rules stored in the block 24 are based on the input volume signal 5l (xi), the human body detection signal 52 (x
The value of 2) is the antecedent part, and the value of the volume adjustment level el (yl) is the consequent part. A volume adjustment level e1 (yl) is defined respectively.

After amplifying the signal yl, the amplifier 25 sends it to the volume il1 node 4 as a volume adjustment level el.

Volume Ill! The ff section 4 increases the volume output by the loudspeaker 5 to the instructed volume level fJIi! Verse 11.

FIG. 3 shows the input x1 input to the fuzzy inference device 23.
．． It is a graph showing a membership function used when fuzzifying x2 and further defuzzifying the calculation result to a specific output y1. Figure a shows a membership function representing the degree of compatibility between the input x1 representing the volume signal s1 and each fuzzy label. The figure shows a membership function representing the degree of compatibility between the input x2 representing the human body detection signal s2 and each fuzzy label.

The horizontal axis of each of these figures represents specific detected values.

Further, FIG. C is a membership function regarding the output yl indicating the volume control level e1.

These membership functions are optimally set according to specific equipment installation conditions, such as the location of the station, the number of trains arriving and departing, the length of the platform, and the number of loudspeakers installed.

In this volume control device configured in this way, for example,
When the surrounding volume is relatively low (xi-PS) and the number of people around is also relatively small (x2=Ps), a small value (311-PS) is output as the volume il1 node level, and the volume of the loudspeaker 5 is becomes smaller.

Similarly, if the volume or number of people around you increases, the volume will increase accordingly! j1 verse is done.

As a result, broadcast content is always transmitted reliably, and
Broadcasting at excessive volume is eliminated, and the degree of noise pollution to the surroundings can be reduced.

In addition, when this volume control device is used for a telephone bell, if the room is noisy due to a TV etc., the ringer will ring at a correspondingly loud volume, and if the room is quiet, the ringer will ring at a lower volume. can do.

Similarly, when used in alarms for gas leaks, fires, etc., if the surrounding area is noisy, the alarm can be emitted at a louder volume to ensure reliable communication.

In addition, this device can be used in a headphone stereo to automatically set the volume to 1l1 so as not to disturb surrounding passengers on the train.
It is also possible to use it as a single verse.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing an embodiment of a volume control device according to the present invention, Fig. 2 is a block diagram showing the configuration of a fuzzy inference section, and Fig. 3 shows membership functions set in the fuzzy inference device. This is a graph showing. 1... Volume sensor 2... Human body detection sensor 3... Fuzzy inference section 4... Volume adjustment section 5... Loudspeaker ■... Sample/hold circuit 2... Sample/hold circuit 3 ...Fuzzy inference device 5...Ampt...Volume UNw Ruberto...Volume signal 2...Human body detection signal M...Passenger Figure 3

Claims (1)

[Claims] 1. A sensor that detects the volume around the sounding body, a sensor that detects the number of people around the sounding body, and a fuzzy inference using a membership function from the outputs of both sensors to determine the surrounding situation. 1. A volume adjustment device comprising: means for calculating a necessary and minimum output volume value according to the output volume value; and means for adjusting an output level of a sounding body based on the calculated output volume value.